Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

public class Test { public static void main(String ar[]) { Integer a = 10; Integer b =10; Integer c = 145; Integer d = 145; System.out.println(a==b); System.out.println(c==d); } }

iGate,

7 13433

How to prevent to create multiple objects of a java class?

ASD Lab, TCS,

3 9128

What is OOPS Concept?

Cap Gemini,

1 5009

What is access modifiers?

Cap Gemini,

1 4418

Explain JSP life cycle

Cap Gemini,

1 4082

How do you implement polymorphism in our day to day life?

Cap Gemini,

3285

What is design pattern and there types?

Cap Gemini,

2 6586

What is aggregation?

Cap Gemini,

1 4041

solve this is my problem byte a=40,byte b=50 both add value is 90 this is with in range of byte... byte range is -128to 127.... why this pgm gives error like type mismatch.... package javapgms; public class byte1 { public static void main(String args[]) { byte a=40,b=50; byte c=a+b; System.out.println(c); } } note : dont use int k... a,b,c are in byte range... mind it..

2 6391

Why Static variable required in java?For ex,class A { static int a; int b; } Why static is required?

Ericsson,

5 9040

Why method overloading and method overriding required in java?

Ericsson, Wipro,

1 5155

In collection sorting comparable and comparator interface will be used..but why this two interfaces required..two will work same purpose so why there are two interfaces instead of one?when to use comparator and when to use comparable?

Ericsson,

1 4980

What is OOPs & Why?

3 5260

String is mutable or immutable?

3 6920

INTERVIEW QUESTION FOR ANDROID

2198

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Un-Answered Questions { Core Java }

What is not object oriented programming?

994

Is null an object java?

1048

What are the two ways to create a thread?

1061

What is a list in java?

994

What is set and get methods in java?

1043

What is difference between float and double?

1014

Realized?

2229

How to use arraylist in java netbeans?

1096

State the main difference between c++ and java?

1142

why Interface used?

1032

What are wrapper classes in java?

1130

What are the uses of java?

1140

Is set ordered?

1032

What is the default value of local and global variables?

1137

Give a brief description of java socket programming?

1007

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